how to draw by hand an arc in 3d
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Hi, this is Ethan Nguyen for My Drawing Tutorials.com and in this video, I'm going to bear witness yous how to draw a 3D hole optical illusion. Hither's what the illusion will wait like. 
At present let me show you how I did it.
Step 1 – Drawing the Ellipses
The first step is to draw a big ellipse. The balance of the drawing volition be done in ink, but I volition draw this start ellipse in pencil because we will exist erasing it later. 
Next, draw a smaller ellipse within the first one using ink. You'll desire to make this one slightly shorter and more rounded. And instead of placing information technology right in the center, movement it downward slightly. 
By the mode, I fabricated a low-cal pencil sketching of the entire drawing earlier mitt and is now only going over it with ink. That way, the drawing process will be a lot smoother and you won't accept to see me erasing and re-drawing a bunch of times. But when you're drawing this yourself, don't be agape to change things around a agglomeration of times to get the curves just right. Then draw another smaller ellipse within this one. Once again, you'll want to make information technology more rounded and place it closer towards the bottom. 
Echo this process three more times. 
You can see the blueprint very clearly here. Each ellipse is a little more similar a circle and they group together at a single point.
Pace 2 – Drawing the Tiles
Next, we're going to describe some straight lines from the centre outward. 
The gaps between these lines will be widest at the bottom and gradually narrow equally they move upwards. To help planing out the spacing and brand them more consistent, I similar to start at both ends at the same time. That way I'll have a adept idea of how wide the stripes at the top will be and plan accordingly. 
One important detail is to brand sure you finish up with an even number of stripes. Y'all'll see why this is important in a minute. One time we take all the stripes drawing in, let's erase the outer well-nigh circle. 
Step three – Inking and Shading
Now, we'll use a sharpie mark to fill in the outer circle using an alternating pattern. This is why information technology'due south of import to accept a even number of stripes. If the stripes were odd, it would throw the pattern out of sync. 
The large sharpie marking won't be able to color in the squares all the manner to the border, and so we'll only go every bit shut to the edge every bit we can for now. Go on doing this for all the circles. 
Now, allow'due south take a smaller pen and fill in the small gaps that we couldn't go with the larger mark. 
The concluding footstep is to create a dark gradation at the center pigsty. I'll utilize a 9xxb graphite pencil to put in a base of operations tone. You likewise tin can use a 4B or 6B pencil for this. 
And I'll employ a blending stump to smoothen out the tone. 
And now I'll use a charcoal pencil to put in a really night layer for the hole. 
And that's it! Now all we have to practise is look at this drawing at an angle to see the 3D optical illusion.
Source: https://mydrawingtutorials.com/how-to-draw-a-3d-hole-optical-illusion/
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